Carrier 17EX specifications Troubleshooting Guide, Controls for Optional Pumpout Compressor

Water must be within design ¯ow limits, clean, and treated to ensure proper chiller performance and reduce the po- tential of tube damage due to corrosion, scaling, ero- sion, and algae. Carrier assumes no responsibility for chiller damage resulting from untreated or improperly treated water.

Inspect the Starting Equipment Ð Before work- ing on any starter, shut off the chiller, and open all discon- nects supplying power to the starter.

The disconnect on the starter front panel does not de- energize all internal circuits. Open all internal and re- mote disconnects before servicing the starter.

Never open isolating knife switches while equipment is operating. Electrical arcing can cause serious injury.

Inspect the starter contact surfaces for wear or pitting on mechanical-type starters. Do not sandpaper or ®le silver- plated contacts. Follow the starter manufacturer's instruc- tions for contact replacement, lubrication, spare parts ordering, and other maintenance requirements.

Periodically vacuum or blow off accumulated debris on the internal parts with a high-velocity, low-pressure blower.

Power connections on newly installed starters may relax and loosen after a month of operation. Turn power off and retighten. Recheck annually thereafter.

Loose power connections can cause voltage spikes, over- heating, malfunctioning, or failures.

Check Pressure Transducers Ð Prior to start-up and once a year, the pressure transducers should be checked against a pressure gage reading. Check all three transducers: oil pressure, condenser pressure, and cooler pressure.

Note the evaporator and condenser pressure readings on the STATUS01 screen on the LID. Attach an accurate set of refrigeration gages to the cooler and condenser Schrader ®t- tings. Compare the two readings. If there is a difference in readings, the transducer can be calibrated, as described in the Troubleshooting Guide section.

Pumpout System Maintenance Ð For compres- sor maintenance details, refer to the 06D, 07D Installation, Start-Up, and Service Instructions.

OPTIONAL PUMPOUT COMPRESSOR OIL CHARGE Ð Use oil conforming to Carrier speci®cations for reciprocat- ing compressor usage. See Table 11.

Oil should be visible in the compressor sight glass both during operation and at shutdown. Always check the oil level before operating the compressor. Before adding or chang- ing oil, relieve the refrigerant pressure as follows:

1.Attach a pressure gage to the gage port of either com- pressor service valve (Fig. 34).

2.Close the suction service valve and open the discharge line to the storage tank or the chiller.

3.Operate the compressor until the crankcase pressure drops to 2 psig (13 kPa).

4.Stop the compressor and isolate the system by closing the discharge service valve.

5.Slowly remove the oil return line connection. Add oil as required.

6.Replace the connection and reopen the compressor serv- ice valves.

PUMPOUT SAFETY CONTROL SETTINGS (Fig. 47) Ð The pumpout system high-pressure switch should open at 161 psig (1110 kPa) and close at 130 psig (896 kPa). Check the switch setting by operating the pumpout compressor and slowly throttling the pumpout condenser water.

Fig. 47 Ð Controls for Optional Pumpout

Compressor

Ordering Replacement Chiller Parts Ð When or- dering Carrier speci®ed parts, the following information must accompany an order:

·chiller model number and serial number

·name, quantity, and part number of the part required

·delivery address and method of shipment

MOTOR REPLACEMENT PARTS Ð Replacement or re- newal parts information for the motor and any auxiliary de- vices can be obtained from the nearest Westinghouse Motor Company sales office. A complete description of the needed part(s) is necessary, together with the complete motor name- plate reading for positive motor identi®cation.

EXTERNAL GEAR REPLACEMENT PARTS Ð Replace- ment or renewal parts information for the external gear and any auxiliary devices can be obtained from the nearest Nut- tall or Lufkin sales office. A complete description of the needed part(s) is necessary, together with the complete gear name- plate reading for positive identi®cation.

TROUBLESHOOTING GUIDE

Overview Ð The PIC has many features to help the op- erator and the technician troubleshoot a 17EX chiller.

·By using the LID display, the actual operating conditions of the chiller can be viewed while the unit is running.

·The CONTROL ALGORITHM STATUS table includes screens with information that can be used to diagnose prob- lems with chilled water temperature control, chilled water

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